diff --git a/fdelmodc/threadAffinity.c b/fdelmodc/threadAffinity.c
index bd9913ca40cb9d42b3151b53b62810fa1cbabf50..0fcee39c331948fa03d1754f623b03c2d77641a9 100644
--- a/fdelmodc/threadAffinity.c
+++ b/fdelmodc/threadAffinity.c
@@ -10,6 +10,9 @@
 #include <sched.h>
 #include <sys/types.h>
 #include <sys/sysctl.h>
+#ifdef _OPENMP
+#include <omp.h>
+#endif
 
 #define CPU_SETSIZE	1024
 #define SYSCTL_CORE_COUNT   "machdep.cpu.core_count"